Hello,
you will need to perform update of the Taranis firmware to version 2.2. Earlier version unfortunately does not support the integration.
You can download it here:
http://www.open-tx.org/2016/12/03/opentx-2.2.0RC8Because it is still in development, you have to enable Nightly builds in the Companion preferences.
Also it is needed to update SD Card content.
If you will be unable to start it with a new firmware, you will have to load it via builtin bootloader.
I recommend to backup everything first.
Or you can just wait until they will release it as a final version. Unfortunately it takes little bit longer than expected
But 2.2.0-RC8 is nearly finished.